/* MindForge — design system */
:root {
  /* dark (default) */
  --bg: #0a0d1a;
  --bg-elev: #11152a;
  --surface: #161b32;
  --surface-2: #1d2340;
  --ink: #eef0f8;
  --ink-soft: #a5acc4;
  --ink-mute: #6c728a;
  --hairline: #ffffff0e;
  --hairline-strong: #ffffff1c;
  --accent: #7d9bff;       /* electric indigo */
  --accent-soft: #4a5d99;
  --warm: #f0a868;         /* warm copper */
  --mint: #4ed8b8;         /* teal */
  --plum: #b88ad9;
  --rose: #e98aa6;
  --shadow: 0 1px 0 #ffffff05 inset, 0 12px 40px #0009;
  --radius: 14px;
  --max: 1280px;
  --font-display: "Instrument Serif", "Iowan Old Style", "Source Han Serif SC", Georgia, serif;
  --font-body: "Geist", "PingFang SC", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;
}

html[data-theme="light"] {
  --bg: #f6f4ee;
  --bg-elev: #fbfaf5;
  --surface: #ffffff;
  --surface-2: #fbfaf5;
  --ink: #0e1320;
  --ink-soft: #4b536b;
  --ink-mute: #8a8f9f;
  --hairline: #0e132011;
  --hairline-strong: #0e132022;
  --accent: #2c4296;
  --accent-soft: #6680c5;
  --warm: #c97f3f;
  --mint: #1f9176;
  --plum: #7c4ea3;
  --rose: #b8466b;
  --shadow: 0 1px 0 #ffffff inset, 0 8px 28px #0e132010;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "cv11";
  transition: background .25s, color .25s;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--hairline-strong); transition: color .15s, border-color .15s; }
a:hover { color: var(--mint); border-bottom-color: var(--mint); }

.container { max-width: var(--max); margin: 0 auto; padding: 0 32px; }

/* ----- Topbar ----- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--hairline);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px; max-width: var(--max); margin: 0 auto;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-display); font-weight: 400;
  font-size: 22px; letter-spacing: -.01em;
  color: var(--ink); border: 0;
}
.brand-mark {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  position: relative;
}
.brand-mark svg { width: 100%; height: 100%; }
.nav { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.nav a {
  font-size: 13px; color: var(--ink-soft); border: 0;
  font-weight: 500; font-family: var(--font-mono); letter-spacing: -.01em;
}
.nav a:hover { color: var(--accent); }

.toolbar { display: flex; gap: 10px; align-items: center; }
.lang-toggle, .theme-toggle {
  display: inline-flex; border: 1px solid var(--hairline-strong); border-radius: 999px;
  overflow: hidden; background: var(--surface);
  font-size: 12px; font-weight: 600;
}
.lang-toggle button, .theme-toggle button {
  background: transparent; border: 0; color: var(--ink-soft);
  padding: 6px 14px; cursor: pointer; font: inherit;
  letter-spacing: .02em;
}
.lang-toggle button.active, .theme-toggle button.active {
  background: var(--ink); color: var(--bg);
}

/* ----- Hero ----- */
.hero {
  padding: 130px 0 100px;
  position: relative; overflow: hidden;
  border-bottom: 1px solid var(--hairline);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 80% 0%, color-mix(in srgb, var(--accent) 22%, transparent) 0%, transparent 55%),
    radial-gradient(ellipse at 0% 70%, color-mix(in srgb, var(--mint) 12%, transparent) 0%, transparent 50%);
}
.hero-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 80px; align-items: center; position: relative; }
.eyebrow {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .14em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 24px;
  font-weight: 500;
}
.hero h1 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 0.98;
  letter-spacing: -.025em;
  margin: 0 0 28px;
}
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-lede {
  font-size: 19px; line-height: 1.55; color: var(--ink-soft);
  max-width: 580px; margin-bottom: 36px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 999px;
  font: inherit; font-size: 14px; font-weight: 500;
  cursor: pointer; border: 0; transition: transform .15s, background .15s, color .15s;
  font-family: var(--font-body);
}
.btn-primary { background: var(--ink); color: var(--bg); border: 0; }
.btn-primary:hover { background: var(--accent); color: var(--bg); border: 0; }
.btn-ghost {
  background: transparent; color: var(--ink); border: 1px solid var(--hairline-strong);
}
.btn-ghost:hover { background: var(--surface); color: var(--ink); }
a.btn { border: 0; }
a.btn-ghost { border: 1px solid var(--hairline-strong); }

.hero-system {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
  box-shadow: var(--shadow);
  font-family: var(--font-mono); font-size: 13px; line-height: 1.85;
}
.hero-system .label {
  font-family: var(--font-body); font-size: 11px; text-transform: uppercase;
  letter-spacing: .14em; color: var(--ink-mute); margin-bottom: 18px; font-weight: 500;
}
.hero-system .formula b { color: var(--accent); font-weight: 600; }
.hero-system .formula .ops { color: var(--warm); font-weight: 700; }
.hero-system .formula em { color: var(--mint); font-style: normal; }

/* ----- Section ----- */
.section { padding: 110px 0; border-bottom: 1px solid var(--hairline); position: relative; }
.section.alt { background: var(--bg-elev); }

.section-head {
  display: grid; grid-template-columns: 220px 1fr; gap: 60px;
  margin-bottom: 60px; align-items: start;
}
.section-num {
  font-family: var(--font-mono); font-size: 12px; color: var(--accent);
  letter-spacing: .14em; font-weight: 500;
  border-top: 1px solid var(--hairline-strong); padding-top: 16px;
}
.section-title {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(36px, 4.5vw, 60px); line-height: 1.02;
  letter-spacing: -.025em; margin: 0 0 18px;
}
.section-title em { font-style: italic; color: var(--accent); }
.section-lede {
  font-size: 17px; color: var(--ink-soft); max-width: 660px; line-height: 1.55;
}

/* ----- Module 1 — Cognitive Atlas ----- */
.atlas-shell {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px;
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow);
}
.atlas-svg {
  width: 100%; aspect-ratio: 1.15; min-height: 460px;
  border-radius: 10px;
}
.atlas-node {
  cursor: pointer; transition: transform .15s;
}
.atlas-node:hover { filter: brightness(1.15); }
.atlas-node.active circle { stroke: var(--accent); stroke-width: 2.5; }
.atlas-detail {
  display: flex; flex-direction: column; gap: 18px;
}
.atlas-detail .tag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--accent); text-transform: uppercase; font-weight: 500;
}
.atlas-detail h3 {
  font-family: var(--font-display); font-size: 36px; font-weight: 400;
  margin: 0 0 4px; letter-spacing: -.02em; line-height: 1.05;
}
.atlas-detail h3 em { font-style: italic; color: var(--accent); }
.atlas-detail p { font-size: 15px; color: var(--ink-soft); margin: 0; line-height: 1.6; }
.atlas-detail-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--hairline-strong);
  border: 1px solid var(--hairline-strong); border-radius: 10px; overflow: hidden;
  margin-top: 8px;
}
.atlas-detail-cell { background: var(--surface-2); padding: 16px 18px; }
.atlas-detail-cell h4 {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-mute); margin: 0 0 8px; font-weight: 500;
}
.atlas-detail-cell p { font-size: 13.5px; line-height: 1.55; color: var(--ink); margin: 0; }

/* ----- Personality ----- */
.personality {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
  align-items: start;
}
.trait-list {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
}
.trait {
  display: grid; grid-template-columns: 100px 1fr 50px;
  align-items: center; gap: 16px; padding: 14px 0;
  border-bottom: 1px dashed var(--hairline-strong);
}
.trait:last-child { border-bottom: 0; }
.trait .name {
  font-family: var(--font-display); font-size: 22px; font-weight: 400;
  letter-spacing: -.01em;
}
.trait .name span { display: block; }
.trait-bar {
  position: relative; height: 6px; border-radius: 3px;
  background: var(--surface-2); overflow: hidden;
}
.trait-bar::after {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  background: linear-gradient(90deg, var(--accent-soft), var(--accent));
  border-radius: 3px;
  width: var(--w);
}
.trait-bar.warm::after { background: linear-gradient(90deg, var(--warm), var(--rose)); }
.trait-bar.mint::after { background: linear-gradient(90deg, var(--mint), var(--accent)); }
.trait-bar.plum::after { background: linear-gradient(90deg, var(--plum), var(--accent)); }
.trait-bar.rose::after { background: linear-gradient(90deg, var(--rose), var(--warm)); }
.trait .pct { font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); text-align: right; }

.maturity {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
}
.maturity h3 {
  font-family: var(--font-display); font-size: 26px; font-weight: 400;
  margin: 0 0 6px; letter-spacing: -.01em;
}
.maturity .sub {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 24px;
}
.stage-row {
  position: relative; padding: 14px 0 14px 38px;
  border-left: 1px solid var(--hairline-strong);
  margin-left: 8px;
}
.stage-row::before {
  content: ""; position: absolute; left: -7px; top: 22px;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--hairline-strong);
}
.stage-row.active::before { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.stage-row .label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase; font-weight: 500;
}
.stage-row h4 {
  font-family: var(--font-display); font-size: 22px; font-weight: 400;
  margin: 4px 0 6px; letter-spacing: -.01em;
}
.stage-row p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.55; }

/* ----- Emotion ----- */
.emotion-layout { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; }

.emotion-wheel {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
  display: flex; flex-direction: column; align-items: center;
}
.wheel-svg { width: 100%; max-width: 380px; aspect-ratio: 1; }
.wheel-svg path { cursor: pointer; transition: opacity .15s, transform .15s; transform-origin: center; }
.wheel-svg path:hover { opacity: .8; }
.wheel-svg path.active { transform: scale(1.04); }
.emotion-label {
  margin-top: 20px; font-family: var(--font-display); font-size: 26px;
  font-weight: 400; text-align: center; letter-spacing: -.01em;
  min-height: 36px;
}
.emotion-label em { font-style: italic; color: var(--accent); }
.emotion-cause { color: var(--ink-soft); font-size: 13.5px; text-align: center; min-height: 22px; margin-top: 4px; }

.regulation {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
}
.regulation h3 {
  font-family: var(--font-display); font-size: 28px; font-weight: 400;
  margin: 0 0 6px; letter-spacing: -.01em;
}
.regulation .sub {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 22px;
}
.reg-step {
  display: grid; grid-template-columns: 36px 1fr; gap: 16px;
  padding: 14px 0; border-bottom: 1px dashed var(--hairline-strong);
}
.reg-step:last-child { border-bottom: 0; }
.reg-step .num {
  font-family: var(--font-mono); font-size: 11px; color: var(--accent);
  letter-spacing: .1em; padding-top: 5px;
}
.reg-step h5 {
  font-family: var(--font-display); font-size: 19px; font-weight: 500;
  margin: 0 0 4px; letter-spacing: -.01em;
}
.reg-step p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.55; }

/* ----- Decision Lab ----- */
.bias-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px; background: var(--hairline-strong);
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--hairline-strong);
  margin-bottom: 40px;
}
.bias-card {
  background: var(--surface); padding: 26px; cursor: pointer;
  transition: background .15s;
}
.bias-card:hover { background: var(--surface-2); }
.bias-card .glyph {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--accent); margin-bottom: 12px;
}
.bias-card h4 {
  font-family: var(--font-display); font-size: 22px; font-weight: 400;
  margin: 0 0 8px; letter-spacing: -.01em; line-height: 1.2;
}
.bias-card p { font-size: 14px; color: var(--ink-soft); margin: 0; line-height: 1.55; }

.decision-sim {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 36px;
}
.decision-sim h3 {
  font-family: var(--font-display); font-size: 28px; font-weight: 400;
  margin: 0 0 16px; letter-spacing: -.01em;
}
.decision-sim .prompt {
  font-size: 15px; color: var(--ink-soft); margin-bottom: 22px; line-height: 1.6;
}
.choice-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 24px; }
.choice {
  background: var(--surface-2); border: 1px solid var(--hairline-strong);
  border-radius: 12px; padding: 20px; cursor: pointer;
  transition: all .15s; text-align: left;
  font: inherit; color: var(--ink); font-family: var(--font-body);
}
.choice:hover { background: var(--bg-elev); border-color: var(--accent-soft); }
.choice.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.choice .label {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase; margin-bottom: 8px;
}
.choice.active .label { color: var(--warm); }
.choice .head {
  font-family: var(--font-display); font-size: 19px; font-weight: 500;
  letter-spacing: -.01em; margin-bottom: 6px;
}
.choice .desc { font-size: 13px; opacity: .85; line-height: 1.5; }

.outcome {
  background: var(--surface-2); border: 1px dashed var(--hairline-strong);
  border-radius: 10px; padding: 24px;
}
.outcome .head {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  color: var(--ink-mute); text-transform: uppercase; margin-bottom: 14px;
}
.outcome-row {
  display: grid; grid-template-columns: 130px 1fr; gap: 18px;
  padding: 10px 0; border-bottom: 1px dashed var(--hairline);
  font-size: 14px;
}
.outcome-row:last-child { border-bottom: 0; }
.outcome-row .horizon {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em;
  color: var(--accent); padding-top: 3px; font-weight: 500;
}
.outcome-row .text { color: var(--ink-soft); line-height: 1.55; }

/* ----- Habit System ----- */
.habit-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.habit-loop {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
}
.habit-loop h3 {
  font-family: var(--font-display); font-size: 26px; font-weight: 400;
  margin: 0 0 6px; letter-spacing: -.01em;
}
.habit-loop .sub {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 22px;
}
.habit-svg { width: 100%; aspect-ratio: 1.4; }
.dopamine {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 30px;
}
.dopamine h3 {
  font-family: var(--font-display); font-size: 26px; font-weight: 400;
  margin: 0 0 6px; letter-spacing: -.01em;
}
.dopamine .sub {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 22px;
}
.dopa-bar { display: grid; grid-template-columns: 100px 1fr 50px; gap: 14px; align-items: center; padding: 8px 0; font-size: 13px; }
.dopa-bar .name { color: var(--ink-soft); }
.dopa-track { height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; }
.dopa-fill { height: 100%; border-radius: 4px; background: linear-gradient(90deg, var(--mint), var(--accent)); }
.dopa-fill.high { background: linear-gradient(90deg, var(--warm), var(--rose)); }
.dopa-bar .value { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink); text-align: right; }

/* ----- Learning ----- */
.learning-pyramid {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px;
  align-items: stretch;
}
.pyramid-svg { width: 100%; }
.metacog-list { display: flex; flex-direction: column; gap: 14px; }
.metacog-item {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 22px;
  border-left: 3px solid var(--accent);
}
.metacog-item:nth-child(2) { border-left-color: var(--mint); }
.metacog-item:nth-child(3) { border-left-color: var(--warm); }
.metacog-item:nth-child(4) { border-left-color: var(--plum); }
.metacog-item:nth-child(5) { border-left-color: var(--rose); }
.metacog-item h4 {
  font-family: var(--font-display); font-size: 20px; font-weight: 500;
  margin: 0 0 4px; letter-spacing: -.01em;
}
.metacog-item .level {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  color: var(--ink-mute); text-transform: uppercase; margin-bottom: 8px;
}
.metacog-item p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.55; }

/* ----- Social ----- */
.social-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--hairline-strong); border: 1px solid var(--hairline-strong); border-radius: var(--radius); overflow: hidden; }
.social-card { background: var(--surface); padding: 28px; }
.social-card .badge {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 10px;
}
.social-card h4 {
  font-family: var(--font-display); font-size: 22px; font-weight: 400;
  margin: 0 0 8px; letter-spacing: -.01em;
}
.social-card p { color: var(--ink-soft); font-size: 14px; margin: 0; line-height: 1.55; }
.attach-meter { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.attach-pip {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .04em;
  padding: 3px 10px; border-radius: 999px;
  background: var(--surface-2); color: var(--ink-soft);
}

/* ----- Coach ----- */
.coach {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); overflow: hidden;
  display: grid; grid-template-columns: 290px 1fr; min-height: 580px;
  box-shadow: var(--shadow);
}
.coach-side {
  background: var(--bg-elev); border-right: 1px solid var(--hairline);
  padding: 26px;
}
.coach-side h4 {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-mute); margin: 0 0 14px; font-weight: 500;
}
.coach-pill {
  background: transparent; border: 1px solid var(--hairline-strong);
  border-radius: 10px; padding: 10px 14px; font: inherit; font-size: 13px;
  cursor: pointer; width: 100%; text-align: left; margin-bottom: 8px;
  color: var(--ink-soft); transition: all .15s; line-height: 1.4;
}
.coach-pill:hover { background: var(--surface); color: var(--ink); }
.coach-main { display: flex; flex-direction: column; }
.coach-stream { flex: 1; padding: 30px; overflow-y: auto; max-height: 580px; }
.msg { margin-bottom: 22px; max-width: 88%; }
.msg.user { margin-left: auto; }
.msg .role {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-mute); margin-bottom: 6px; font-weight: 500;
}
.msg .bubble {
  background: var(--surface-2); border: 1px solid var(--hairline);
  border-radius: 14px; padding: 14px 18px; font-size: 14.5px; line-height: 1.6;
}
.msg.user .bubble { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.msg .bubble p { margin: 0 0 8px; }
.msg .bubble p:last-child { margin-bottom: 0; }
.msg .bubble strong { color: var(--accent); font-weight: 600; }
.msg.user .bubble strong { color: var(--warm); }
.coach-input {
  border-top: 1px solid var(--hairline); padding: 18px;
  display: flex; gap: 10px; background: var(--bg-elev);
}
.coach-input input {
  flex: 1; border: 1px solid var(--hairline-strong); border-radius: 999px;
  padding: 12px 18px; font: inherit; font-size: 14px;
  background: var(--surface); color: var(--ink);
  font-family: var(--font-body);
}
.coach-input input:focus { outline: 2px solid var(--accent-soft); outline-offset: 1px; }
.coach-input input::placeholder { color: var(--ink-mute); }

/* ----- Timeline ----- */
.timeline-card {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--radius); padding: 36px;
}
.timeline-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.timeline-head h3 {
  font-family: var(--font-display); font-size: 26px; font-weight: 400;
  margin: 0; letter-spacing: -.01em;
}
.timeline-head .meta {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-mute); letter-spacing: .04em;
}
.timeline-svg { width: 100%; aspect-ratio: 2.6; }
.timeline-legend { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 20px; font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-soft); }
.legend-dot {
  display: inline-flex; align-items: center; gap: 6px;
}
.legend-dot::before {
  content: ""; width: 10px; height: 2px; background: var(--accent);
}
.legend-dot.b::before { background: var(--mint); }
.legend-dot.c::before { background: var(--warm); }
.legend-dot.d::before { background: var(--plum); }

/* ----- Footer ----- */
.footer {
  background: var(--bg-elev);
  padding: 80px 0 40px;
  border-top: 1px solid var(--hairline);
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 56px; }
.footer h5 {
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: .12em; color: var(--accent); margin: 0 0 18px; font-weight: 500;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; font-size: 14px; }
.footer a { color: var(--ink-soft); border: 0; }
.footer a:hover { color: var(--accent); }
.footer-brand { font-family: var(--font-display); font-size: 32px; color: var(--ink); font-weight: 400; letter-spacing: -.01em; margin-bottom: 14px; }
.footer-tag { color: var(--ink-mute); font-size: 14px; max-width: 320px; line-height: 1.55; }
.footer-bottom {
  border-top: 1px solid var(--hairline); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12.5px; color: var(--ink-mute); font-family: var(--font-mono);
}
.footer-bottom a { color: var(--ink-mute); border: 0; }
.footer-bottom a:hover { color: var(--accent); }

/* ----- i18n ----- */
html[data-lang="en"] [lang="zh"] { display: none !important; }
html[data-lang="zh"] [lang="en"] { display: none !important; }
html[data-lang="en"][lang="zh"], html[data-lang="zh"][lang="en"] { display: block !important; }

/* ----- Responsive ----- */
@media (max-width: 960px) {
  .nav { display: none; }
  .hero { padding: 80px 0 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 50px; }
  .section { padding: 70px 0; }
  .section-head { grid-template-columns: 1fr; gap: 20px; margin-bottom: 36px; }
  .atlas-shell, .personality, .emotion-layout, .habit-layout, .learning-pyramid, .social-grid { grid-template-columns: 1fr; gap: 24px; }
  .choice-list { grid-template-columns: 1fr; }
  .coach { grid-template-columns: 1fr; min-height: 0; }
  .coach-side { border-right: 0; border-bottom: 1px solid var(--hairline); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .toolbar { gap: 6px; }
  .lang-toggle button, .theme-toggle button { padding: 5px 10px; font-size: 11px; }
}

/* ----- utility ----- */
.fade-in { opacity: 0; transform: translateY(8px); transition: opacity .5s, transform .5s; }
.fade-in.in { opacity: 1; transform: none; }